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[lakotazz]

I have the low/high set at 120/160 deg F.  Anything higher and I get the occasional overheating problems. As far as temps in the firebox, they fluctuate from extremely hot (every time I load it) to mostly smoldering during the day. I don't use it in the summer so I never get long periods of smoldering.

I've always figured additions to deal with creosote were good for fireplaces that are used now and then, but generally couldn't do much with the volume I burn in my boiler. I think that's what the local stove guy told me - bad information?

FYI - I haven't had a chimney fire since my first post, but I'll keep you updated.

[m21221]

The 120 in 120/160 is awful low.  If your boiler temp is at 120 than you can bet the flue gas is even lower which combined with other factors like wood species and moisture content is a recipe for big time creosote formation.  Good luck.